You press a button on your thermostat, and cold air flows into your home. For many homeowners, that’s where the knowledge of your air conditioner begins and ends. But, a lot happens in those crucial moments between the time you turn on the thermostat and when air starts flowing. The inner workings of an air conditioner involve several main components you may be familiar with—a compressor, a fan, an evaporator coil, and more. Other lesser-known components may not get the most attention, but they perform valuable—and, in many cases, indispensable—functions to the overall cooling process.
One easily overlooked component is an air conditioner condensate drain line. While it may not seem like much, this pipe and drainage system keeps your air conditioner (and your home) safe from costly damage. Here’s the 411 on everything you need to know about your air conditioner’s condensate drain line.
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Where it is
Your air conditioner has a condensate drain line that runs from the indoor unit to the outside of your home. You’ll find a white PVC or copper pipe located near your outdoor unit—this is where the drain line ends. Near your indoor unit, you’ll find a vertical PVC pipe with a cap on it, which acts as the access point for the condensate drain. Most condensate drain lines use gravity as their main mechanism, however some may use a small pump to expedite the drainage process.
What it does
Your air conditioner does more than just cool your home, it also dehumidifies it by drawing heat and moisture from the air. This humidity turns into condensation, which can back up In a drain pan connected to the indoor portion of your air conditioner. This is where the job of the condensate line comes in. This drain connects directly from your air conditioner to the outdoors, giving condensation a way out of your home.
How to spot (and fix) a clog
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Your condensate line keeps moisture from building up inside your air conditioner. Moisture build up can lead to mold, mildew, algae, corrosion, and even dangerous damage to your home. A clog in the line can cause costly flooding and water damage, and, in rare cases, a clog can also cause a house fire when backed up water leaks onto electrical components of your air conditioner. Here are some common signs of clogs to look out for:
- Water leakage coming from your ceiling or attic
- Stained ceiling or walls
- A muggy, humid feeling in your home
- Unfamiliar or unpleasant smells due to mold/algae buildup
- Air conditioner shuts off and won’t turn back on
Fixing a clogged condensate line
Some air conditioners automatically shut off when the condensate line becomes clogged. This is particularly true of newer models. If your air conditioner did not shut off automatically, the first step is to turn it off yourself. You don’t want your air conditioner to continue running, as this introduces more water and more backup to an already clogged situation. There are several methods you can use to clear a clog from your drain line. Of course, it’s also always an option to contact an HVAC professional and have them clear the clog and clean the drain for you if you’re not comfortable doing it yourself.
Wet/dry vacuum
A wet/dry vacuum can be used to remove any clogs in your drain line with the power of suction. You can rent one from most hardware or grocery stores. If your drain line clogs frequently, it may be a good idea to invest in one to have on hand. After turning off your air conditioner, locate your drain line runoff—the white or copper PVC pipe attached to the exterior of your home. Then, follow the following steps to use the wet/dry vacuum to remove the clog:
- Attach the vacuum hose to the end of the drain line. Make sure you have an airtight seal. You can secure a cloth towel or duct tape around the opening of the drain line to make sure there are no gaps between the vacuum hose and the drain line.
- Run the vacuum for 1-2 minutes.
- Open the vacuum and see if you’ve removed the clog. If you see a lot of brown-colored water, or some algae buildup, you likely removed the clog.
- If the vacuum is empty, repeat step 2 as needed. If the clog does not clear after several attempts, you may have a severe clog that needs to be cleared by a professional.
Garden hose
If you don’t have a wet/dry vacuum, a garden hose can also sometimes be used to break up clogs with water pressure. The force of the water running through the drain can force the algae buildup out of it. Follow these steps to make this method work:
- Connect the head of the garden hose to the opening of the condensate drain.
- Maintain a tight connection between the drain and the hose with your hand and run the hose on high in short bursts. This should allow the water to travel upwards and break up any clogs in the drain.
- Repeat step 2 until the water runs clear.
Vinegar or hydrogen peroxide
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This method involves pouring a liquid down the drain line access pipe with the intent of breaking up the clog internally. The drain line access pipe is located near your indoor unit, which may be in your attic, crawl space, or garage, typically installed on top of the gas furnace in your home. Simply pour a cup of vinegar or hydrogen peroxide down the drain and let it sit for 30 minutes while the chemicals begin to make their way through the drain. This can help break down the clog, making it easier to pass on its own. After the 30 minutes is up, flush the drain with water to ensure everything is flowing as it should.
How to prevent clogs
Clogs in your drain line can be annoying, but they’re also preventable. Before you turn on your air conditioner for the start of the cooling season, pour a cup of bleach down the drain line access pipe. This will prevent bacteria, mold, and mildew from growing in the first place, keeping the drain clear all season long.
Many HVAC companies also inspect and clear the condensate drain line during a standard maintenance visit. As part of our exclusive 26-point maintenance plan, an expert Chas Roberts technician will clear any existing clogs in your condensate drain line, along with inspecting the whole system top to bottom to ensure that there’s nothing standing between you and clean, cool air.
Air conditioner questions? Contact Chas Roberts
A condensate drain line is one of the many components that keeps your air conditioner running smoothly. For questions about anything and everything related to air conditioning, contact the experts at Chas Roberts. With over 75 years of experience, there’s no problem too big (or too small) for us to handle.
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